484 LYCAENID. SINTHUSA. 
the bases of the subcostal nervules, its greatest area being in the subcostal interspace above 
the subcostal nervure. In shape this patch is as in Viracho/a, in which genus it reaches to the 
origin of the upper disco-cellular nervule, while here it stops considerably short of that point. 
The eyes are very hairy. 
The genus Sin/husa appears to be a small and compact one, containing eight species up to 
date according to the various authors who have described them. ‘There is much similarity 
between them ; inthe males of all except 5. virgo, Elwes, the upperside is black, the basal half 
of the forewing obscurely blue, of the hindwing more or less brilliant blue. In S. virgo the 
upperside is pale blue with broad outer black margins. On the underside all the species have 
a short band defining the disco-cellular nervules, and a discal band which is more or less broken 
on both wings, the hindwing with the anal lobe and the spot in the first median interspace on 
the margin black crowned with orange, with some greenish-silvery markings between them and 
above the anallobe. The females are fuliginous-black above, sometimes with an orange or 
ochreous-white patch on the disc of the forewing, usually with more or less white towards the anal 
angle of the hindwing. All the species are forest insects, of small size, and quick flight, settling 
on the leaves of trees and bushes. The genus occursthroughout the Himalayas, in Assam, and 
thence southwards through the Malay Peninsula, and in Sumatra, Java, and China. The Indian 
species appear to be very variable, and when all shall be thoroughly known about them several 
will doubtless have to be sunk as synonyms. The females of all the species are very much rarer 
than the males. 
Key to the Indian species of Sinthusa. 
A. Male, upperside, forewing obscure dark blue on basal half, hindwing rich brilliant blue. 
a. Male, upperside, hindwing usually with the blue coloration confined broadly to the outer 
margin: both sexes, underside, with the markings very narrow, straight, and clearly 
defined. 
rors. S. NASAKA, Himalayas, Assam, Java. 
to16, S. 4MBaA, Burma, Malay Peninsula, 
b. Male, upperside, hindwing with the blue coloration spread oyer the entire surface ; both 
sexes, underside, with the markings much broader, more irregular, and Jess distinct, 
1017. S. CHANDRANA, Himalayas, Assam, Upper Burma. 
B. Male, upperside, both wings shining light silvery blue. 
1018. S. virco, Sikkim. 
1015. Sinthusa nasaka, Horsfield. 
Thecla nasaka, Horsfield, Cat. Lep. E. I. Co., p. 91, n. 23 (1829) ; Deudorix nasaka, Hewitson, Ill. Diurn, 
Lep., p. 24, n. 21, pl. v, figs. 45, 45, male (1863) ; Hyfolycena nasata, Moore, Proc. Zool. Soc. Lond., 1882, 
p. 2493; id., de Nicéville, Journ. A. S. B., vol. lii, pt. 2, p. 77,n. 17, pl. ix, fig. 2, female (1883) ; Sinthusa 
nasaka, Moore, Journ. A. S. B., vol. liti, pt. 2, p. 34 (1884). 
Hapirat: Kangra District, Kulu Valley, Sikkim, Assam, Java. 
Expanse: go, rooto 1153 2, 1°25 inches. 
Descriprios : ‘*MaLe. UppersiDE, doth wings deep blackish-brown, Forewing with 
a shade of dark blue from the base to the middle, which only appears in acertain light. Aznd- 
wing narrow and somewhat lengthened, with a slight oblong excavation along the posterior 
margin, succeeded by an obtusely-rounded tooth exterior of the caudal appendage ; covered 
with a rich cyaneous tint excepting the exterior [costal] and interior borders ; the latter is gray, 
and constitutes a canal to receive the abdomen. UNDERSIDE, doth wings gray with pale ochra- 
ceous-brown posterior borders, spreading over the tip and more intensely-coloured exteriorly ; 
a narrow delicately-striped band, consisting of two parallel brown strigz edged with white and 
an intermediate yellow thread, which is more distinct in the hindwing, extends across the 
middle of both wings, being regular in the former and somewhat interrupted in the latter, until 
it reaches the anal region, where it passes, after an abrupt curve, irregularly flexuose to the inner 
margin ; on the disc of each wing stands a short transverse double litura. Azndwing has the 
anal appendage oblong, black on the surface, fringed with gray, and has adjoining toit, in the 
